Cylindrical lenses are characterized by one of the surfaces being cylindrical opposed to typical spherical shape. Both convex and concave surfaces are available, while the second surface is most often flat. The unusual shape changes the beam transformation and from a point subject, a line image is projected, as opposed to a typical point image. Cylinder lenses find its use in many different applications, where nonlinear beam shaping is necessary. The example uses include illumination systems for line detectors or slotted diaphragms in spectroscopy and creation of pattern indicators for scanners in medical techniques.